30 August 2017 On optical-absorption peaks in a nonhomogeneous dielectric material over a two-dimensional metallic surface-relief grating
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Abstract
The rigorous coupled-wave approach (RCWA) was used to calculate the optical absorption in a dielectric material deposited over a two-dimensional (2D) metallic surface-relief grating. The dielectric material was taken to be nonhomogeneous in the direction normal to the mean plane of the grating. The grating was chosen to comprise hillocks on a square grid. On illumination by a monochromatic plane waves, the chosen structure should support the excitation of two types of guided-wave modes: surface-plasmon-polariton (SPP) waves and waveguide modes (WGMs). Two cases were considered: (i) a 1D photonic crystal made from layers of silicon oxynitrides of differing composition, and (ii) a tandem solar cell comprising three amorphous-silicon p-i-n junctions. Optical absorption was studied in relation to the direction of propagation, polarization state, and the free-space wavelength of the incident plane wave. Several but not all absorptance peaks were correlated with the excitations of SPP-wave modes and WGMs predicted by the solutions of the underlying canonical boundary-value problems for guided-wave propagation. Some peaks of useful absorptances in the solar cell were also predicted by solutions of the canonical problems.
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Faiz Ahmad, Faiz Ahmad, Tom H. Anderson, Tom H. Anderson, Benjamin J. Civiletti, Benjamin J. Civiletti, Peter B. Monk, Peter B. Monk, Akhlesh Lakhtakia, Akhlesh Lakhtakia, } "On optical-absorption peaks in a nonhomogeneous dielectric material over a two-dimensional metallic surface-relief grating", Proc. SPIE 10356, Nanostructured Thin Films X, 103560I (30 August 2017); doi: 10.1117/12.2274142; https://doi.org/10.1117/12.2274142
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